使用孕育坑并选用A1—10Sr作为孕育剂对镁合金点焊熔核进行孕育处理，研究了锶添加量对镁合金电阻点焊熔核组织与力学性能的影响。结果表明：当A1—10Sr的添加量从0增加到1．4mg时，熔核组织中胞状树枝晶区平均宽度从332pm减小至58μm，组织明显细化；且点焊接头最大拉剪力从2．379kN逐渐提高到2．959kN，提高了24．3％。
AI-10Sr as the inoculant of the nugget was added into a inoculation pit to investigate the effect of Sr additive amount on the microstructure and mechanical properties of resistance spot welded magnesium alloy. Results show that when the additive amount of AI-10Sr increased from 0 to 1.4 mg, the average width of cellular dendritic crystal zone decreased from 332 μm to 58 μm, the microstructure refined obviously. The tensile shear load of the joints increased by 24.3% from 2. 379 kN to 2. 959 kN.
参考文献
| [1] | 王亚荣,张忠典,冯吉才,刘辉.镁合金交流和直流点焊接头组织分析[J].焊接学报,2004(06):11-14. |
| [2] | 刘生发,王慧源.Sr对AZ91镁合金铸态组织的影响及其细化机制[J].稀有金属材料与工程,2006(06):970-973. |
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